1 files changed, 77 insertions, 0 deletions
diff --git a/Kernel/VirtualAddress.h b/Kernel/VirtualAddress.h
new file mode 100644
index 0000000000..2c82cb0d40
--- /dev/null
+++ b/Kernel/VirtualAddress.h
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/LogStream.h>
+#include <AK/Types.h>
+
+class VirtualAddress {
+public:
+    VirtualAddress() {}
+    explicit VirtualAddress(FlatPtr address)
+        : m_address(address)
+    {
+    }
+
+    explicit VirtualAddress(const void* address)
+        : m_address((FlatPtr)address)
+    {
+    }
+
+    bool is_null() const { return m_address == 0; }
+    bool is_page_aligned() const { return (m_address & 0xfff) == 0; }
+
+    VirtualAddress offset(FlatPtr o) const { return VirtualAddress(m_address + o); }
+    FlatPtr get() const { return m_address; }
+    void set(FlatPtr address) { m_address = address; }
+    void mask(FlatPtr m) { m_address &= m; }
+
+    bool operator<=(const VirtualAddress& other) const { return m_address <= other.m_address; }
+    bool operator>=(const VirtualAddress& other) const { return m_address >= other.m_address; }
+    bool operator>(const VirtualAddress& other) const { return m_address > other.m_address; }
+    bool operator<(const VirtualAddress& other) const { return m_address < other.m_address; }
+    bool operator==(const VirtualAddress& other) const { return m_address == other.m_address; }
+    bool operator!=(const VirtualAddress& other) const { return m_address != other.m_address; }
+
+    u8* as_ptr() { return reinterpret_cast<u8*>(m_address); }
+    const u8* as_ptr() const { return reinterpret_cast<const u8*>(m_address); }
+
+    VirtualAddress page_base() const { return VirtualAddress(m_address & 0xfffff000); }
+
+private:
+    FlatPtr m_address { 0 };
+};
+
+inline VirtualAddress operator-(const VirtualAddress& a, const VirtualAddress& b)
+{
+    return VirtualAddress(a.get() - b.get());
+}
+
+inline const LogStream& operator<<(const LogStream& stream, VirtualAddress value)
+{
+    return stream << 'V' << value.as_ptr();
+}